// ========================================================================
// Copyright (c) 2004-2009 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
// You may elect to redistribute this code under either of these licenses.
// ========================================================================

package org.eclipse.jetty.util.log;

import java.lang.reflect.Method;

/**
 *
 */
public class LoggerLog implements Logger
{

	private final Object _logger;
	private final Method _debugMT;
	private final Method _debugMAA;
	private final Method _infoMT;
	private final Method _infoMAA;
	private final Method _warnMT;
	private final Method _warnMAA;
	private final Method _setDebugEnabledE;
	private final Method _getLoggerN;
	private final Method _getName;
	private volatile boolean _debug;

	public LoggerLog(Object logger)
	{
		try
		{
			_logger = logger;
			Class<?> lc = logger.getClass();
			_debugMT = lc.getMethod("debug", new Class[] { String.class, Throwable.class });
			_debugMAA = lc.getMethod("debug", new Class[] { String.class, Object[].class });
			_infoMT = lc.getMethod("info", new Class[] { String.class, Throwable.class });
			_infoMAA = lc.getMethod("info", new Class[] { String.class, Object[].class });
			_warnMT = lc.getMethod("warn", new Class[] { String.class, Throwable.class });
			_warnMAA = lc.getMethod("warn", new Class[] { String.class, Object[].class });
			Method _isDebugEnabled = lc.getMethod("isDebugEnabled");
			_setDebugEnabledE = lc.getMethod("setDebugEnabled", new Class[] { Boolean.TYPE });
			_getLoggerN = lc.getMethod("getLogger", new Class[] { String.class });
			_getName = lc.getMethod("getName");

			_debug = (Boolean)_isDebugEnabled.invoke(_logger);
		} catch (Exception x)
		{
			throw new IllegalStateException(x);
		}
	}

	public String getName()
	{
		try
		{
			return (String)_getName.invoke(_logger);
		} catch (Exception e)
		{
			e.printStackTrace();
			return null;
		}
	}

	public void warn(String msg, Object... args)
	{
		try
		{
			_warnMAA.invoke(_logger, args);
		} catch (Exception e)
		{
			e.printStackTrace();
		}
	}

	public void warn(Throwable thrown)
	{
		warn("", thrown);
	}

	public void warn(String msg, Throwable thrown)
	{
		try
		{
			_warnMT.invoke(_logger, msg, thrown);
		} catch (Exception e)
		{
			e.printStackTrace();
		}
	}

	public void info(String msg, Object... args)
	{
		try
		{
			_infoMAA.invoke(_logger, args);
		} catch (Exception e)
		{
			e.printStackTrace();
		}
	}

	public void info(Throwable thrown)
	{
		info("", thrown);
	}

	public void info(String msg, Throwable thrown)
	{
		try
		{
			_infoMT.invoke(_logger, msg, thrown);
		} catch (Exception e)
		{
			e.printStackTrace();
		}
	}

	public boolean isDebugEnabled()
	{
		return _debug;
	}

	public void setDebugEnabled(boolean enabled)
	{
		try
		{
			_setDebugEnabledE.invoke(_logger, enabled);
			_debug = enabled;
		} catch (Exception e)
		{
			e.printStackTrace();
		}
	}

	public void debug(String msg, Object... args)
	{
		if (!_debug)
			return;

		try
		{
			_debugMAA.invoke(_logger, args);
		} catch (Exception e)
		{
			e.printStackTrace();
		}
	}

	public void debug(Throwable thrown)
	{
		debug("", thrown);
	}

	public void debug(String msg, Throwable th)
	{
		if (!_debug)
			return;

		try
		{
			_debugMT.invoke(_logger, msg, th);
		} catch (Exception e)
		{
			e.printStackTrace();
		}
	}

	@SuppressWarnings("deprecation")
	public void ignore(Throwable ignored)
	{
		if (Log.isIgnored())
		{
			warn(Log.IGNORED, ignored);
		}
	}

	public Logger getLogger(String name)
	{
		try
		{
			Object logger = _getLoggerN.invoke(_logger, name);
			return new LoggerLog(logger);
		} catch (Exception e)
		{
			e.printStackTrace();
			return this;
		}
	}
}
